Fuel-oil burner



Oct. 14 1924.

W. M. HOFFMAN FUEL OIL BURNER Filed May 13, 1922 2 Sheets-Sheet l WILLIAM '-1- "UFF/"IAN Patented Get. 14, 1924.

UNIT ED S T A TfE S P TE N T E..

WILLIAM IVI. l-IOFIEIVLI',4 OF -BUFFALQ zYRK, fAgSSIGNLOR/BY ZMESNESASSIGN- fMENTS, TO OIL -FUEL :ENGINEERING CORPORATION, "A 'CORPORATION'.F NEW YORK.

Application filed May 13, 1922.

T 0 all Iw 710my t may concern:

Be it known that I IILLIAM M. I-Iorr- MAN, a. citizen of the United States, residing at Buffalo, county of Erie,` State of New York, have invented a certain new and useful Improvement in Fuel-Oil Burners, and declare the following tol be a` full,xclear, and exact description of .the sameysuch as will enable others skilled inthe art to which vit pertainsto make and use the same, reference being had to the accompanying drawings, which, form apart of' this specification.

My invention relates to fuel oil burners. The object is to provide an improved type of fuel oil burner adapted tomake use .of the cheaper lgrades of heavy, low quality fuel oils, which containa large percentage of tarry, or other residual material in such a manner as to secure maximum efficiency at a.v minimum cost.

The above, and other objects together with details of` construction and method of operation will more fully appear from the following description of the embodiment of my r invention as illustrated in the accompanying drawings 'and defined in the appended claims.

Inv the accompanying drawings,-

Figure l is ka vertical longitudinal sectional view through a'form of my improved burner.

Fig. 2 is a. rear end elevation of the burner shown in Fig. l.

Fig. 3 is a sectional View taken on line 3 3 of Fig'. l.

Fig. 4 is a vertical longitudinal sectional view through a modified form of my burner.

Fig. 5 is a rear end elevation of the burner shown in Fig. 4.

Fig. 6 is a sectional view taken on the 'line 6--6, of Fig. 4.

My improved burner comprises a hollow combustion chamber casing l0, here shown in the form of a cylinder and open at one end for the discharge of products of combustion and provided with a refractory lining 1l.

I prefer to construct integrally with the casing a steam pre-heater ring 13 which is positioned at the outlet of the combustion chamber and adapted to form a discharge mouth therefor. Steam is fed to this preheater from a suitable source of supply, which is not shown in the drawings, through a conduit 14, and conducted from the preheater after being heated by the exhaust FUEL-OIL BURNER.

Serial No. 560,579.

gases Ifrom 'the combustion chamber lto a nozzle 16, which nozzle enters the rear end of the conibustion chamber and' is supported by the web portionlT which extends` across the rear end of the combustion.chamber casing. This web construction ofthe rearend` burned upon the outer surface thereof. rThisv core is so positioned within the interior of the combustion chamber asto 4provide .van open expanse of combustion, chamber therearound, being here shownas supported clear of the combustion chamber wall by means of supporting stanfdards'20 and positioned substantially axially within the chamber.

In the. construction 'shown in Figs. l and 3, the core itself ishollow and the interior serves asa well to contain liquid fuel, to which well fuel is'fed through a conduit 2l from a suitable source of fuel 'supply not shown. rFhe upper wall kofthe core is shown as perforated, as at 22, to permitthe escafpe of fuel therethrough to the outer covering o-f porous refractory material -through which it percolates tothe outer surface upon which it is burned. These perforations may be provided in such number and so disposed as it is desired, but I prefer to locate them in the upper portion of the core, as shown in the construction shown in Figs. 4 to 6 inclusive. The core is jacketed, as shown, and the fuel is fed to the jaicketed portion 23 through a conduit 21, as described. The jacketed portion is `provided with perforations 221L through which the fuel feeds to the outer porous refractory wall port-ion.

In the construction shown in Fig. l, the core is tapered at the end opposite the discharge mouth of the combustion chamber, as shown at 24, and the nozzle 16 is so formed with a flaring mout-h 25 as to project the vapor et against the tapered end of the core so that it will Hare thereover, spreading over the refractory porous wall portion and projecting the burning productsl of combustio-n toward the contracted neck or discarrying the burning products of combustion toward the vcontracted mouth portion where the combustion isl completed.

I lVhat I claim is:

l. In a `fuel oil burner, in combinatioma hollow combustion chamber having an outlet for the discharge of products of combustion, a core formed of porous refractory material upon the outer surface of which combustion takes place, which core is positioned within the interior of said combustion chamber, means for projecting a vapor jet into said chamber, and a vapor preheater positioned at the outlet of said chamber to be heated by the discharge of products of combustion.

2. In ak fuel oil burner, in combination, a hollow combustion chamber having an outlet for the discharge of products of combustion, a combustion chamber core having an outer wall portion of porous refractory material, said core positioned interiorly within said chamber spaced from the wall thereof so as to form a combustion chamberl therearound, vapor jet producing means positioned so as to project a vapor jet into said chamber around said core and toward the outlet thereof,` and means for feeding fuel oil to said core to percolate to the outer surface thereof.

3. In a fuel oil burner, a hollow combustion chamber open for the discharge of products of combustion, a hollow core the interior of which is adapted to serve as an oil well and which is provided with an outer wall portion of porous refractory material through which fuel oil may percolate from the well to be burned upon the outer surface thereof, said core positioned interiorly within said combustion chamber spaced from the wall thereof, jet-producing means adapted to project a vapor jet into the interior of said chamber around said core, and air inlet openings to said combustion chamber around said jet.

t. Ina fuel oil burner, in combination, a hollow combustion chamber having an outlet for the discharge of products of combustion, a porous refractory core positioned within the interior of said chamber upon the outer surface of which combustion takes place, said core tapered at the end furthest from the outlet of said chamber, vapor jet producing means positioned so as to `project a vapor jet against the taperedy end of said core and means for feeding fuel oil to said core.

5. In a fuel oil burnera hollow combustion chamber having an opening for the discharge of products of combustion, a porous refractory core positioned within said combustion chamber, means for feeding fuel oil to said core to percolate therethrough and to be burned upon the outer surface thereof, jet producing means positioned to project a vapor jet into the interior of said combustion chamber, and means interposed intermediate said jet producing means and said core to spreadthe vapor jet to pass over the outer surface of the core.v

In testimony whereof, I sign this specification.

WILLIAM M. HOFFMAN. 

